Update LMS/LMOTS tests

Document tests and source of data, use test RNG, pass more parameters
into each test

Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/tests/suites/test_suite_lms.function b/tests/suites/test_suite_lms.function
index 92a5a07..148075d 100644
--- a/tests/suites/test_suite_lms.function
+++ b/tests/suites/test_suite_lms.function
@@ -1,55 +1,44 @@
 /* BEGIN_HEADER */
 #include "mbedtls/lms.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
 
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
- * depends_on:MBEDTLS_LMS_C:MBEDTLS_LMS_PRIVATE:MBEDTLS_PSA_CRYPTO_C:MBEDTLS_CTR_DRBG_C
+ * depends_on:MBEDTLS_LMS_C:MBEDTLS_LMS_PRIVATE:MBEDTLS_PSA_CRYPTO_C
  * END_DEPENDENCIES
  */
 
 /* BEGIN_CASE */
-void lms_sign_verify_test ( data_t * msg )
+void lms_sign_verify_test ( data_t *msg, data_t *seed )
 {
     mbedtls_lms_public_t pub_ctx;
     mbedtls_lms_private_t priv_ctx;
     unsigned char sig[MBEDTLS_LMS_SIG_LEN(MBEDTLS_LMS_SHA256_M32_H10, MBEDTLS_LMOTS_SHA256_N32_W8)];
-    mbedtls_entropy_context entropy_ctx;
-    mbedtls_ctr_drbg_context drbg_ctx;
-    uint8_t seed[16];
     int rc;
 
-    mbedtls_entropy_init( &entropy_ctx );
-    mbedtls_ctr_drbg_init( &drbg_ctx );
     mbedtls_lms_init_public( &pub_ctx );
     mbedtls_lms_init_private( &priv_ctx );
 
-    TEST_ASSERT( mbedtls_ctr_drbg_seed( &drbg_ctx, mbedtls_entropy_func,
-                 &entropy_ctx, ( uint8_t* )"", 0 ) == 0 );
-    TEST_ASSERT( mbedtls_ctr_drbg_random( &drbg_ctx, seed, sizeof( seed ) ) == 0 );
-
-    /* Allocation failure isn't a test failure, since it likely just means there's not enough memory to run the test */
+    /* Allocation failure isn't a test failure, since it likely just means
+     * there's not enough memory to run the test.
+     */
     rc = mbedtls_lms_generate_private_key( &priv_ctx, MBEDTLS_LMS_SHA256_M32_H10,
                                            MBEDTLS_LMOTS_SHA256_N32_W8,
-                                           mbedtls_ctr_drbg_random, &drbg_ctx, seed,
-                                           sizeof( seed ) );
+                                           mbedtls_test_rnd_std_rand, NULL,
+                                           seed->x, seed->len );
     TEST_ASSUME( rc != MBEDTLS_ERR_LMS_ALLOC_FAILED );
     TEST_ASSERT( rc == 0 );
 
     TEST_ASSERT( mbedtls_lms_calculate_public_key( &pub_ctx, &priv_ctx ) == 0 );
 
-    TEST_ASSERT( mbedtls_lms_sign( &priv_ctx, mbedtls_ctr_drbg_random,
-                                   &drbg_ctx, msg->x, msg->len, sig,
-                                   sizeof( sig ), NULL ) == 0 );
+    TEST_ASSERT( mbedtls_lms_sign( &priv_ctx, mbedtls_test_rnd_std_rand, NULL,
+                                   msg->x, msg->len, sig, sizeof( sig ),
+                                   NULL ) == 0 );
 
     TEST_ASSERT( mbedtls_lms_verify( &pub_ctx, msg->x, msg->len, sig,
                                      sizeof( sig ) ) == 0 );
 
 exit:
-    mbedtls_entropy_free( &entropy_ctx );
-    mbedtls_ctr_drbg_free( &drbg_ctx );
     mbedtls_lms_free_public( &pub_ctx );
     mbedtls_lms_free_private( &priv_ctx );
 }